NDLI: Environmental and genetic determinants of the male forceps length dimorphism in the European earwig Forficula auricularia L.

Content Provider	Springer Nature Link
Author	Tomkins, J. L.
Copyright Year	1999
Abstract	Male dimorphisms are particularly conspicuous examples of alternative reproductive strategies. The male forceps length dimorphism in the European earwig Forficula auricularia has long been considered an example of a status- (body size) dependent male dimorphism. In this paper, I test three hypotheses relating to the dimorphism of F. auricularia. First, that the dimorphism is status dependent and determined by nutrition. Second, that the dimorphism is a density-dependent adaptation. Third, that there is a genetic basis to population differences in morph frequency seen in the field. These hypotheses were tested by rearing two populations in a split-family rearing design with two diets and two densities. Populations of male earwigs reared in the common garden differed in forceps length and relative forceps length. The populations also differed in the morph frequencies, with 40 versus 26% long-forceped males. These results confirm the notion that there is a genotype-by-environment interaction that determines the morph frequency in a population. There were only minor effects of density on male forceps length and no influence of density on the male dimorphism. In accordance with the hypothesis that the morphs are status-dependent alternatives, large-forceped males only arose on the high-protein diet that produced earwigs of a large body size. However, not all large males produced the long-forceped phenotype. I put forward an extension of the status-dependent dimorphism model that may account for the pattern of forceps dimorphism in this species.
Starting Page	1
Ending Page	8
Page Count	8
File Format	PDF
ISSN	03405443
Journal	Behavioral Ecology and Sociobiology
Volume Number	47
Issue Number	1-2
e-ISSN	14320762
Language	English
Publisher	Springer-Verlag
Publisher Date	1999-12-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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European earwig, Forficula auricularia L. (Dermaptera: Forficulidae), at the Hanford Reach National Monument, Washington State

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Differential effects of offspring condition-dependent signals on maternal care regulation in the European earwig

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Data from: Surrounding pathogens shape maternal egg care but not egg production in the European earwig (Dataset)

Maternal condition determines offspring behavior toward family members in the European earwig

Environmental and genetic determinants of the male forceps length dimorphism in the European earwig Forficula auricularia L.

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Courtship Roles of Male and Female European Earwigs, Forficula auricularia L. (Dermaptera: Forficulidae), and Sexual Use of Forceps

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